How Calorie Needs Are Calculated
Your daily calorie requirement is made up of two main parts: your Basal Metabolic Rate (BMR) — the energy your body needs just to function at rest — and an activity multiplier that accounts for how much you move. Together these give your TDEE, the baseline from which a calorie target for weight loss is usually set.
The main factors that affect your number
- Body weight and height — larger bodies generally burn more calories at rest.
- Age — metabolic rate tends to decline gradually with age.
- Biological sex — differences in muscle mass mean estimates vary; most standard formulas account for this.
- Activity level — from mostly sedentary to very active, your movement multiplies your BMR significantly.
What a calorie deficit means in practice
To lose weight, most approaches involve consuming fewer calories than your TDEE — commonly described as a calorie deficit. A modest deficit (often cited in general nutrition guidance as roughly 300–500 kcal below TDEE) is typically considered more sustainable than a steep one, particularly on a GLP-1 medicine where appetite is already reduced. These are general educational figures; the right target for you is something to agree with your prescriber or a registered dietitian, not something to set in isolation.
Why this matters more on a GLP-1 medicine
Medicines like Mounjaro (tirzepatide) and Wegovy (semaglutide) reduce appetite and can make it easy to eat too little without realising. Tracking calories helps you confirm you are still hitting a meaningful protein intake and not falling so far below your needs that energy and muscle mass suffer. For a deeper look at this topic, see our guide on working out your calorie needs step by step, and our page on how many calories a person typically needs per day.
You can also explore the broader picture on our calorie tracking overview — covering what calories are and how they interact with your GLP-1 journey.
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Once you know your calorie target, the harder part is actually tracking against it every day — especially when appetite is low and meals are smaller and less predictable. GLP Trackr's AI food photo scan makes this almost effortless: point your camera at a meal and the app estimates calories, protein, and macros instantly, without manual entry.
From there, you can set a personal calorie target inside the app and watch your daily intake stack up in real time. The daily check-in also lets you log weight, energy, and how your appetite feels — useful data to notice patterns over weeks, not just single days.
If you want to bring a clear picture of your intake and progress to your next appointment, the app's insights give you a week-at-a-glance summary you can discuss with your prescriber or dietitian. GLP Trackr is a tracking tool; it does not replace their advice, and any decision about your specific calorie goal should be made with a healthcare professional who knows your full history.
For a complete toolkit around calorie awareness on your GLP-1 journey, visit our calorie calculator hub.
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Frequently asked questions.
Estimate your Total Daily Energy Expenditure (TDEE) by combining your Basal Metabolic Rate — based on weight, height, age, and sex — with an activity multiplier. This gives a baseline; a modest deficit below that figure is commonly used for weight loss. Your prescriber or a dietitian can help set a personalised target.
A calorie deficit — eating less than your TDEE — is generally needed for weight loss. General nutrition guidance often references a deficit of around 300–500 kcal below TDEE as a sustainable starting point, though the right amount varies by individual. Always agree a specific target with your healthcare professional.
GLP-1 medicines reduce appetite, so many people naturally eat less. This makes tracking calories more important, not less — it helps ensure you still meet protein needs and avoid eating so little that energy and muscle mass are affected. Discuss your specific target with your prescriber or dietitian.
GLP Trackr lets you set a daily calorie target and log food via AI photo scan, barcode, or manual search. The app tracks your intake against your goal and provides weekly insights — useful to review with your prescriber or dietitian. It is a tracking tool, not a source of personalised medical advice.
No. BMR is the calories your body needs at complete rest. Your actual daily need — TDEE — is higher, because it accounts for the energy used during movement and activity. Using BMR alone as a daily calorie target would typically underestimate how much your body needs.